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    写一个函数 parseQueryString，它的用途是把 URL 参数解析为一个对象
    函数名：parseQueryString
    参数：URL字符串
    返回值：URL字符串解析后的对象
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<script>
    function parseQueryString(url) {
        let arr = url.split("&");
        let json = {};
        for (let i = 0; i < arr.length; i++) {
            let str = arr[i].split("=");
            json[str[0]] = str[1];
        }

        console.log(json);
    }
    parseQueryString("admin=user&pass=1234");
</script>